Rubber-dam clamp



(No Model.)

' W. G. BROWNE;

RUBBER DAM CLAMP.

No. 396,537. Patented Jan. 22, 1889..

Wm] W046,

NITED STATES IVALKER G. BROIYNE, OF ATLANTA, GEORGIA, ASSIGNOR OF ONE-HALF TO RICHARD B. VINDER, OF BALTIMORE, MARYLAND.

RUBBER-DAM CLAMP.

SPECIFICATION forming part of Letters Patent No. 396,537, dated January 22, 1889.

Application filed November 5, 1888. Serial No. 290,007. (No model.)

To a zrhom it may concern: pairs of clasps n n, which may be adjusted Be it known that I, VALKER G. BROWNE, longitudinally of the bars to bringthem nearly residing at Atlanta, in the State of Georgia, in position to clasp the rubber between them have invented certain new and useful Imand against the teeth. Then when the clamp 55 provements in Rubber-Dam Clamps, of which is applied in the mouth of the patient and the following is a specification, reference be the arms brought together the clasps will ading had therein to the accompanying drawjust themselves to the teeth. A spreader, wedge, or separator, 0, may be This invention relates to clasping devices applied to one or both of the arms a d, said 60 for dental purposes, known to the profession spreader having a blade-like projection, s, to

as rubber-dam clamps. pass between the teeth.

The invention consists in the construction It is evident that the arms a and d may be and combination of the parts constituting more or less bent to conform to the shape of the the dam-clamp, substantially as hereinafter mouth or to give convenience in adjustment 65 stated. and handling. It is evident also that the arms Figure 1 is a top view of the dam-clamp commay be used for the same purpose without the p1ete. Fig. 2 is a bottom view of one of the clasps, they (the arms) being properly shaped arms of the clamp with one of the tooth-clasps so as to conform to the contour of the tooth,

in section. Fig. 3 is a broken bottom view of as indicated in dotted lines, Fig. 1. 7o a part of one of the arms on line so a, Fig. 4;. hat I claim is Fig. -,L is an edge view of the clamp. 1. In a clamp of the character described,

The letter a indicates one bar of the clamp. the two arms pivoted together, a set-screw This arm has an elbow or bent arm, I), through passing through one bar and swiveled in the which arm a thumb-screw, o, is tapped. A other, and longitudinally-adjustable clasps 2 5 bar, (I, is hinged to the end of arm I), and has arranged in pairs and movable longitudinally an inturned arm, 6, to the inner end of which of the bars, all in combination, substantially the set-screw c is loosely swiveled. The bar as described.

d and arm c thus become a bell-crank lever 2. The combination, with the bars a d and fulcrumed to arm I) and actuated by the screw means for opening and closing the same, of

0 c as its power. 'lurning the screw cwill cause the clasps n n, having mortises to pass over the bars a (Z to approach or recede from each said bars, and projections which bear on the other at their outer or free ends. bars and on which the clasps may have a The lower sides of arms a (Z are grooved, as rocking movement, substantially as described. at 72, and in each of these grooves there is a 3. The combination, with the bar, as a, of

3 5 light flat spring, 2', held at one end by a rivet, a clamp, of a friction-spring extending along 7.1, and clasped round the outer ends of the said bar, and the clasp at, having a mortise to bars, as shown at Z. These springs are mere embrace said bar and spring, substantially as friction-springs to prevent the easy longitudidescribed. nal movement of the clasps on the bars. 4. The combination, with the clasping-bars o 40 The inner sides of the bars a d are notched, a, (Z and means for operating the same, of the as at m. A number of clasps, 'n, are applied spreader r, movably supported on one of said to the bars. Each clasp has a mortise to pass bars, said spreader having a wedge or blade, over the bars a d, and is rounded out at the s, to extend between the teeth, substantially inner end to conform generally to a tooth. as described.

45 The mortise in each clasp n is somewhat In testimony whereof Iaffixmy signature in larger than the section of the bars ad, and presence of two witnesses. inside the mortise there is a tooth, o, which 1 enters one of the notches m. The clasp n is ALKLR thus permitted to have a slight rocking mo \Vitnesses:

50 tion on the tooth 0 as a pivot. Y E. J. DOBBs,

The arms a (I may bear one, two, or more V. II. YOUNG. 

